Setting up Collabora to work behind Nginx on Unraid

Hi Friends,
I recently installed Nextcloud Docker on an Unraid server.
I’m running the Nexcloud container behind a reverse proxy with Nginx.
I also want to install and configure Collabora Online to allow Nexcloud to work with office documents, but I can’t figure how to setup Collabora to work behind Nginx and the reverse proxy.
Can anyone please explain the steps I need to take in order to make this work?
Sorry if this should be obvious to me, but I’m not a programmer, so these things are not so simple for me.
Hope someone can help :pray: